I wonder if the mothers DO buy the clothes, or if they send the daughter's out to buy their own clothing.
If the daughters do not have a car, or are not driving age, it is a certain that the mothers bought them the clothes. Besides, if they are wearing those clothes it is almost always because they always wore them, and the mother was dressing when younger for sure.
I once asked a mother of a driving age young girl and they told me that they went with their daughters to buy clothes like in your picture (and worse also platform stilettos). The mother told me that she would wear them too if she was her daughters age.